I tried a LOT of different types of lube, and my absolute favorite is still Slippery Stuff Gel (not the regular liquid.) It doesn't contain glycerin, so it never gets sticky (or promote yeast infections), and it's pretty affordable for a high-quality lube -- you can find 32oz quantities on Amazon for around $25-ish. I've been using it for dilating for a year and a half, and it's also awesome for sex, too!